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Method for detecting TVOC in indoor air

A technology for internal air and detection chambers, applied in measuring devices, instruments, scientific instruments, etc., can solve secondary pollution and other problems, achieve good adsorption effect, and accurately measure TVOC concentration

Active Publication Date: 2018-02-16
广州市赛特检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tenax-TA tube has been used many times, which is easy to cause secondary pollution
The commercial one-time desorption instrument on the market can only achieve 40%-60% of the TVOC desorption rate in the Tenax-TA adsorption tube, and the secondary desorption instrument can only reach 80% of the TVOC desorption rate in the Tenax-TA adsorption tube. about

Method used

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  • Method for detecting TVOC in indoor air
  • Method for detecting TVOC in indoor air
  • Method for detecting TVOC in indoor air

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Embodiment

[0033] One, the main instruments, equipment and reagents used in the present invention are as follows: 1, GC-2010plus gas chromatograph, equipped with FID; 2, BTJ-Ⅲ type thermal desorption instrument; 3, VOCs standard solution in methanol: 1000 μ g / mL; 4 , 1μl syringe; 5, Tenax-TA adsorption tube; 6, high-purity nitrogen purity greater than 99.999%; 7, SGK-5LB low-noise air pump; 8, TH-500 hydrogen generator, hydrogen purity greater than 99.999%; 9, air Resistance test device (-25 ~ 0) kpa; 10. The microwave analysis device is the above-mentioned microwave analysis device, including radiation-proof leakage box, microwave radiation device, Tenax-TA pipe support frame, insulation cover, six-way valve, flow meter and control panel.

[0034] Two, the analysis steps of the present invention are as follows:

[0035] 1. Tenax-TA adsorption tube pretreatment

[0036] ① Thermal analysis pre-treatment: Open the sealing rings at both ends of the adsorption tube, heat and activate with ...

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Abstract

The invention discloses a method for detecting TVOC in indoor air. The method comprises the following steps: 1) collecting an indoor air sample with a Tenax-TA adsorption tube; 2) introducing inert gas into the Tenax-TA adsorption tube after sampling, carrying out microwave desorption, to obtain desorbed gas; and 3) carrying out gas chromatographic analysis of the desorbed gas, and determining thetotal amount of volatile organic compounds in the air. The detection method can solve the problems of poor thermal desorption effect and low utilization rate of a Tenax-TA tube, the Tenax-TA tube after microwave activating treatment has good adsorption effect on the TVOC in the indoor air, and can accurately measure the TVOC concentration in the indoor environment.

Description

technical field [0001] The invention relates to a method for detecting TVOC in indoor air. Background technique [0002] TVOC is the total volatile organic compound, and the sources of VOCs in the indoor environment are mainly released from building materials, cleaning agents, paints, aqueous coatings, adhesives, etc. [0003] The hazards of VOCs are mainly toxicity and irritation, which can cause the imbalance of the body's immune level, affect the function of the central nervous system, and cause symptoms such as dizziness, headache, drowsiness, weakness, and chest tightness. They may also affect the digestive system, causing loss of appetite, nausea, etc., serious Sometimes it can damage the liver and hematopoietic system, and even cause death. [0004] At present, the state has strict restrictions on air TVOC content and detection methods. For example, the detection method stipulated in Appendix G of "Code for Indoor Environmental Pollution Control of Civil Constructio...

Claims

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Application Information

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IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 蔡宝雄许遵洲夏铭辰张秀娟
Owner 广州市赛特检测有限公司
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